Folding machine



Nov. 29, 1932. P. R. GLASS FOLDING MACHINE Filed June 13, 1929 2 Sheets-Sheet l fivvnvrmz ig3% Nov. 29, 1932.

P. R. GLASS FOLDING MACHINE Filed June 13, 1929 2 Sheets-Sheet 2 Patented Nov. 29, 1932 UNITED STATES PATENT OFFICE PERLEY R. GLASS, OF SALEM, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATER-SON, NEW JERSEY, A CORPORATION OF NEW JERSEY FOLDING MACHINE- Application filed June 13,

This invention relates to folding machines of the type in which a plurality of so-called .forms are used to fold the margin of a piece of sheet material, and is herein illustrated as embodied in a machine particularly adapted to fold the rear margins of toe tips which are to be incorporated in the uppers of boots and shoes. V

Machines of this general type are commonly provided with three members or forms the edges of which are curved to correspond to the curvature of the edge of the blank; and these forms are removed and replaced by others when a blank having a differently curved edge is to be operated upon. It will be understood that machines of this kind find their principal use in operating upon the members of large groups of articles the edges of which have the same curvature. .Considering for convenience the folding of the rear margin of a toe tip the edge of which is con? vex, the three members referred to' above comprise a work support having anedge convexly curved to correspond to the convex curvature of the rear edge of the toe tip, a forming plate having a convexly. curved edge like that of the work support, and a third member which may be a bending plate and has a concavely curved edge which fits about the convexly curvededge ofthe work support. 1 a

Hitherto these forms have been expensive owing to their construction and method of manufacture; and the general object of the present invention is to provide 'a machine having simple, inexpensive forms which may be quickly removed and replaced.

According to one feature of the invention these forms are thin sheet metal members. They may be stamped out in their final form, but preferably, after they have been stamped out into approximate or rectangular shape their operative edges will be brought to the desired accurate outlines by means of a profiling or other suitable machine. In the illustrated construction these forms are thin sheet metal plates having notches, holes, or other simple fastening means whereby they may be detachably held in place. The work support is engaged at opposite ends resp'ec 1929. Serial No. 370,694.

tively by two alined pins rotatably mounted spaced holes to receive upright pins mounted in the frame of the machine.

According to another feature of the invention there is provided a pivoted work support and yielding means for holding it inclined to the horizontal. struction, the inner edge of the work support is normally held in a position in which it is as high as the level of the bending plate so that when the work is placed upon the support with its margin extending over the bending plate and the work and the work support are swung downwardly, the margin of the work is bent upinto the path of the folder which is thereupon actuated to fold the bent-up margin over the edge of the forming plate.

These and other features of the invention including certain details of construction and combinations of parts will be described as embodied in an illustrated machine and pointed out in the appended claims. 7 Referring now to the accompanying drawmgs,

Fig. 1 is a perspective of a machine in which the present invention is embodied;

Fig. 2 is a perspective of portions of the bending plate and the folder together with portions of adjacent parts, allshown in separated relation Fig. 3 is a perspective showing in separated relation portions of the forming plate and the work presser;

Fig. l is a perspective showing in separated relation one end of the worksupport and one of the alined pins about-the common axis of which the support is pivoted;

Fig. 5 is a vertical longitudinal section through the machine;

Fig. 6 is a detail in section showing a piece of work in process of being operated upon;

Fig. 7 is a perspective showing in separated relation the latch which connects the carrier for the work presser and the forming; plate with the lever which moves them up and down, and

In the illustrated coni Fig. 8 is a perspective of a toe cap or tip after it has been operated upon by the machine.

The purpose of the machine, as has been explained, is to fold the margin of a piece of sheet material, the present machine being particularly adapted to fold a narrow margin along the rear edge of a toe tip over the body portion thereof so as to produce a finished rear edge on the toe tip, as shown in Fig. 8. Before proceeding to a detailed description of the machine, a brief general description of its construction and mode of operation will be given. The work-engaging parts of the machine normally come to rest in the positions shown in Figs. 1 and 5. These work-engaging parts are a work support, a forming plate, a presser, an edge guide, a bending plate and a folder.

The work support 7 is a thin sheet metal stamping pivoted about the common axis of two alined short pins or shafts 9 which are mounted indirectly upon the work support carrier 11, the work support being held somewhat tilted about its pivotal axis by a springpressed plunger 12. The forward edge of the work support is convexly curved to correspond to the curve of the rear edges of the v group of toe tips which are to be folded, it

being understood that, when a second group of toe tips are to be folded, the rear edges of which have a curvature different from that of the first-named group, the work support will be removed and replaced by another one.

The forming plate 13 is also a thin sheet metal stamping and the outline of its forward edge is the same as that of the work support. It is removable and replaceable.

The presser consists of a plurality of screwthreaded pins 15 carried by a bar. 17 and extending down through'slot-s 19 (Fig. 3) in the forming plate, the purpose of this pin-andslot connection being to permit the forming plate to be withdrawn from beneath the folded-over margin while the presser pins still hold the work firmly upon the work support.

Theedge guide comprises a forked member pivoted at 21 to a stationary part of the machinewhich will be described later. The arms 23 of the fork extend forwardly and downwardly and provide a guide against which the edge of the work may be placed when the work is presented to the machine.

The bending plate 25, like the work support and the forming plate, is a thin sheet metal stamping and is removable and replaceable. Its operative edge is concavely curved to fit about theconvexly curved operative faces of the work support and the folding plate.

The folder 27 has a concavely curved operative face the curvature of which is somewhat more abrupt than that of the most abruptly curved edge of any piece of work which is to be folded.

With the work-engaging parts occupying their normal positions of rest, as shown in Figs. 1 and 5, a toe tip 100 is placed upon the work support 7 with its rear edge in contact with the forked gage 23. Power is now applied to the machine, and the following movements take place. The forming plate 13 and presser pins 15 are brought down together to swing the work and the work support into the position shown in Fig. 6. During this downward movement the margin of the tip, which projects beyond the registering edges of the forming plate and the work support, is engaged by the bending plate 25 and 'bent into an upright position. The folder 27 then moves to the left into the position shown in Fig. 6, thereby folding the upstanding margin of the toe tip over upon the forming plate 13. The forming plate is then moved to the left to withdraw it from beneath the folded-over margin of the toe tip, after which the carrier 11 for the work support is moved up to cause the fold to be pressed against the under face of the folder. This completes the folding operation, the parts of the machine being then returned to their normal position of rest as shown in Figs. 1 and 5.

The presser bar 17 is fast to the lower ends of the arms of a yoke 31 the split hub of which is fastened by a pinch-screw 33 to a tubular carrier 35. The forming plate 13 has a bentup flange at its rear to which are fastened two upright pins 37 having at their upper ends reduced threaded portions. These pins are received in bores in the outer ends of the arms 39 of a second yoke and are fastened in place by means of thumb nuts 41. The yoke, of which the arms 39 are a part, has a split hub which is fastened by a pinch-screw 4:3 to the outer end of a rod 45, said rod being slidable in the bore of the tubular carrier 35. This tubular carrier at its rear end is forked, and the forks terminate in hubs 4:7, 49 which are fast to alined rock shafts rotatably mounted in bearings in the frame of the machine, said rock shafts each having in its outer end a conical recess to receive respectively the conical inner ends of bearing screws 51, 53. The hub 47 has integral with it a forwardly extending arm 55 and it is through this arm that thetubular member 35 is normally held in the raised position shown in Figs. 1 and 5,and 1s swung at the roper'times about the common axis of the caring screws 51, 53.

The arm 55 is normally held in the position shown by means of a spring-pressed plunger 57, the stem of which extends up through an elongated boss formed integral with the arm 55. The arm is pulled down at the proper times by a rocking lever 59, the upper end of which is shown in Fig.1. It is necessary that this lever 59 should be detachably connected with the arm 55, since, as will presently appear, it is necessary to swing the tubular carrier 35 back out of the way in order to remove and replace certain parts of the machine. To this end, the upper end of the lever 59 has fastened therein by means of a set screw 61 the round stem 63 of a square block 65, said block being adapted to be engaged by a latch member. This latch member (Fig. 7) comprises a carrier 67 pivoted at 69 to the arm 55 and urged to rotate in a clockwise direction, as viewed in Fig. 1, by a spring-pressed plunger 71 mounted in a socket in the arm 55. The latch proper 73 has a square recess 7 4 to receive the square block 65, said latch beingslidable vertically on the flat face of a downward extension of the carrier 67 and having a round stem 75 extending up through a bore in the carrier. A thumbscrew 77, threaded into the carrier 67, has a collar 79 extending into a groove in the pin so that, by turning the thumb-screw, the latch may be adjusted vertically. WVherever it is desired to swing the tubular member 35 together with the forming plate and the presser up out of the way, the latch 73 isswun g out of engagement with the block 65. When the tubular member 35 is swung down, the latch snaps over the block again.

It has been explained above that the tubular member 35, which carries the presser and the forming plate, is swung down into the posi tion shown in Fig. 6 by means of the rocking lever 59 (Fig. 1). The forming plate 13 (Fig. 6) must now be moved to the left in order to withdraw it from beneath the folded over margin. In order to permit the forming plate first to be swung down with the presser and then to move horizontally with respect to the presser, the rod 45, by which the forming plate is carried and which is slidable in the tubular member 85, has a roll 80 projecting sidewise from its rear end into a segmental cam track 81 formed in a segmental member 83 which is integral with the upper end of a rocking lever 85. The lever 85 is normally held in such a position that the cam track 81 is concentric with the common axis of the bearing screws 51, 53 so that swinging movement of the rod 45 aboutsaid axis does not move the rod with respect to its tubularcarrier 35. When, however, the parts of the machine have reached the positions shown in Fig. 6, and the forming plate 13 is to be moved to the left, the lever 85 is swung forward thereby pushing forward the rod 45, and with it the forming plate 13; and prior to the return of the parts to their normal positions of rest, the lever 85 is swung back into the position shown.

The lever 59, which swings the tubular arm 35 up and down, is pivoted at 86 tothe frame of the machine and has a roll 88 which runs in a cam track formed in a cam 90 which is fast to the drive shaft 87. The lever 85, which moves the rod 15 forward-and back in the tubular member 35, is pivoted to the frame at 92 and has a roll 94: which runs in a cam track formed in the cam 90.

The work support 7 is mounted for ready removal and replacement upon its carrier 11 as follows: The carrier 11 has rigid with it two upwardly inclined lugs 89 which are spaced apart a distance substantially equal to the length of the work support. Loosely mounted in alined horizontal bores in these lugs are the pins or short shafts 9 which have been referred to above, said pins having slots 91 in their inner ends of a width equal to the thickness of the work support, there being provided in the work support slots 93 to receive the ends of the pins. In order normally to hold the pins in place and to permit them to be drawn out when desired each lug 89 has pivoted to it at 95 a small thin latch 97 whichis adapted to engage its respective pin in a circular groove formed between two collars 99 on the pm. When, therefore, it is desired. to remove the work support and re place it by another one, the latches are swung to the inoperative position shown in Fig. 4c, the pins drawn out until the work support is released, a new work support put in place, the pins pushed in, and the latches swung back into position.

It has been stated above that when the parts have reached the position shown in Fig. 6 and the forming plate 13 has been withdrawn from beneath the folded margin, the work support carrier 11 is pushed up to cause the fold .to be pressed between the work support and the under side of the folder 27. The work support carrier 11 is fast to a heavy casting 101 which is vertically reciprocable in ways formed on the frame of the machine, said casting being held in place in theways by vertical plates 103 which are fastened to the frame. The casting rests upon two heavy springs one of which is shownat 105 (Fig. 5), said springs resting upon nuts, one of which is shown at 107, said nuts being threaded upon the stems of plungers, one of which is shown at 109. The plungers rest upon a hardened plate 111 mounted upon a heavy bar 113 pivoted at its ends to the outer ends of a forked lever 115 rotatably mounted upon an eccentric shaft 117. The purpose of the eccentric shaft is to permit the initial position of the work support to be varied so as to provide for work of different thicknesses. To this end (Fig. 1) a collar 119, pinned to the shaft 117, has an extension provided with a segmental slot and a handle by which it may be turned. A screw bolt 121, which extends through the slot, is threaded into a boss on the frame and, together with a coiled spring and a washer, provides means for holding the shaft 117 in adjusted angular position. The lever 115 is provided at its inner end (Fig. 5) with aroll 122 which runs on cam 124 on the shaft 87, the roll being held at all times in contact with. the cam by a spring-pressed plunger126.

The folder 27- (Fig. 5) is'reciprocated at the proper times by a lever 128 having at its upper end a roll 130 which is received between two lugs extending downwardly from the under side of the folder. The'lever 128 is pivoted at 132 to the frame of the machine and has a roll 134 which runs in a cam'track formed in the cam 90. It should be noted that, when the parts of the machine which are directly above the folder have been removed, the folder may be lifted out of the machine. r V Y It has been explained how the work support 7 and the forming plate13 are readily removable and replaceable by others of dif ferent shape. It remains to explain how the bending plate 25 is similarly removable and replaceable. This plate rests upon a bar 123, being accurately located thereon by means of two pins in the bar, one of which is shown at 125 (Fig. 2) and two holes in the bending plate, one of-which is shown at 127. Thereciprocating folder 27 rests partly upon fiat ledges formed at opposite sides of the frame of the machine and partly upon the bending plate 25; and above the folder is a thick fiat stationary filler plate 129 which rests upon other fiat ledges formed at opposite sides of the frame. Located above this flat plate 129 is a cover 131 comprising a large flat plate having at its rear end two upstanding lugs 133(Fig. 1) provided with bores'to receive the alined rock-shafts in the hubs 47,49, the cover thus being pivoted about the common axis of the rock-shafts and of the bearing screws 51, 53. The cover plate 131 is held firmly down upon suitable fiat surfaces on the frame ofthe machine by two thumbscrews 135 having hexagonal collars, said screws passing through holes 137 in the cover plate and being threaded into "holes 140 in the frame. The cover plate 131 clamps the plate 129 upon suitable fiat-surfacesformed upon the frame, the proper location of the last-named plate being facilitated by two pins, one of which is shown at 141 These pins have upper and lower endsof'reduced diameter, the lower ends being received in sockets in the frame and the upper ends in holes, one of which is shown at 143, in the plate 129. When, now, it is desired'to remove and replace the bending plate 25, it is necessary first to swing the cover plate up out of the way. Before this can be done, not only must the screws 135 be removed, but the tubular member 35 must be disconnected from its operating mechanism so that it too may be swung up. In order to disconnect the tubular member 35 it is necessary merely to swing the latch 73 about its pivot 69 so as to free the latch from the square block 65 carried by the lever 59. .When this has been doneand the screws 135 removed, the cover plate 131, together with the tubular member 35 and the parts carried thereby, may be swung up past a vertical position so as to be out of the way. The plate 129 is first lifted out and then the folder 27, which is detachably connected to its reciprocating mechanism, as has been described; The bending plate 25 may now be removed and replaced by one of different shape, after which the folder 27 and the plate 129 are replaced. The cover-plate 131, and the tubular member 35, are then swung down, whereupon the latch 73 engages again the lever 59 which operates the tubular member. The clamping screws 135 are then screwed into place. The edge guide, as has been explained'above, consists of the two arms 23 of a fork. The base of this fork is pivoted at 21 to up-Jitanding lugs formed upon a block 145 adj ustably fastened to the plate 129 by a clamping screw 147 which passes through a slotin the block and is threaded into the plate. The base of the fork has an upstanding lug 149 (Fig. 1) against which acts a springpressed plunger 151 mounted in a socket in a lug which is integral with the block 145. This yielding pivotal mounting normally holds the arms 23 of the edge guide rosting upon the bending plate 25 and extending across the path of movement of the folder 27, and permits the arms 23 to swing up out of the way when the folder is advanced to fold the work, as shown in Fig. 6.

In the operation of the machine the springpressed plunger 12 acts first to hold the work support 7 in its normally upwardly inclined position and then, after the folding operation has been completed, to return the work support to its normal position. It is desirable, however, that the plunger be held temporarily from-exerting an upward push upon the work support during the folding over of the margin of the cover by the folder. To this end means are provided for temporarily locking the'work support from upward movement. The stem of the plunger has threaded upon it a nut 153 having a flange adapted to be engaged, when the work support is depressed, by a catch which is mounted upon the vertically reciprocable casting 101 upon which the work support carrier 11 is mounted. Referring more particularly to Fig. 1, the catch 155 is pivoted at 157 to a horizontally projecting boss on the casting 101 which, as has been "explained, is raised at the proper time to press the fold. The catch is normally held in the position shown, in which the beveled upper end of its hooked portion lies in the downward path of movement of the nut 153, by a spring pressed plunger 159, with a tail 161 on'the catch located beneath the lower end of'an adjustable stop screw 163. This step screw is threaded through a bore in the outer end of an arm 165, integral with one of. the stationary vertical plates 103 which serve to hold the vertically reciprocable' casting 101 in its upright guideways. When, now, the work support 7 is swung down about its pivot into the position shown in Fig. 6, the 5 plunger 12 is pushed down, and the flange on the nut 153 rides down the beveled upper face on the catch 155 until the hookfof the catch snaps over the upper surface of the flange and thus holds the plunger 12 from up 10 Ward movement. The plunger is so held during the movement of the folder into the position shown in Fig. 6. When, subsequently, the casting 101 is raised to press the fold against the under face of the folder, the catch 155 is raised with it, and its tail 161 engages the stop screw 163, whereupon the catch is swung about its pivot to release the nut 153.

In the operation of the machine, a piece of work such as a toe tip 100 is placed upon the work support 7 with the forward edge of the tip in contact with the arms 23 of the edge guide, and power is applied to the drivlng shaft 87 to cause it to make one revolution. The presser pins 15 and the forming plate 13 are moved down into the position shown in Fig. 6; and, during this movement, the margin of the tip is engaged by the bending plate 25 and bent into an upright position. At the end of the movement the catch 155 has engaged the nut 153 so as to hold the plunger 12 from upward movement. The folder 27 then movesto the left into the position shown in Fig. 6 to fold the margin over the forming plate 13. During this movement the arms 23 of the edge guide ride up until they rest upon the upper surface of the folder. The forming plate 13 is moved to the left (Fig. 6) to withdraw its forward portion from beneath the folded-over margin of the toe tip. The casting 101 is raised to press the fold against the under side of the folder; and this movement of the casting frees the nut 153 from the catch 155 so that, when the presser pins 15 and the forming plate 13 are presently raised and returned to normal inoperative position, the work support 7 may swing up.

The parts of the machine are then returned to their normal positions as shown in Figs. 1 and 5.

When it is desired to change the machine to adapt it to operate upon a toe tip having a differently curved edge, the latch member 67 (Fig. 1) is swung to disconnect the arm 55 from the operating lever 59; the screws 135 are removed, and then the cap plate 131 is swung back about the common axis of the screws 51, 53. The plate 129 and the folder 27 are now lifted out to expose the bending plate 25 which is then lifted out and replaced by a new one, the plate 129 and the folder 27 then being put back into place. The work support 7 is removed by swinging the latches 97 out of engagement with the short shafts 05 or pins 9 and pulling the pins out of engage- .chine is ready to operate.

ment with the work support. A new work support is now fastened in place by means of the pins 9 and latches 97. The forming plate 13 is removed by removing the nuts 11 and pulling the stems 37 of the plate out of their sockets in the ends of the arms 39. A new forming plate is then put into place and fastened by the nuts 41. The cap plate 131 and the tubular carrier 35 are swung down into the position shown, whereupon the latch member 67 reengages the operating lever 59. Thecap screws 135 are replaced, and the ma- Althoughthe invention has been described as embodied in a particular machine adapted to operate upon a particular kind of work, it should be understood that the invention is not limited in the scope of its application to the particular machine or to operation upon the particular kind of work which has been shown and described. 1 V

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. A machine of the class described having,

incombination, a work support in the form of a thin flat plate, a work support carrier having means for detachably and pivotally engaging the plate, a forming plate, a folder, and means for operating the forming plate and the folder. I

2. A machine of the class described having, in combination, a work support in the form of a thin flat plate, a work support carrier having alined shafts for detachablyengaging the plate, a forming plate, afolder, and means for operating the forming plate and the folder. I w 1 3. A machine of the class described having, in combination, a'work support in the form of a thin plate,'a work support carrier having means for engaging the plate at opposite points on opposite edges thereof, a forming plate, a folder, and means for operating the forming plate and the folder.

4. A machine of the class described having, in combination, a work support in the form of a thin plate having means at opposite localities on opposite edges by which it may be engaged, a work support carrier having means for engaging said first-named means, a forming plate, a folder, and means for operating the work against the work support and thereby swinging the work support about its pivotal axis, and means for folding the margin of the work.

7. A machine of the class described having, in combination, a folder, a forming plate, means for operating the forming plate and the folder, a work support carrier, two alined pins rotatably mounted in the work support carrier, and a work support pivoted about the common axis ofthe pins.

8. A machine of the class described having, in combination, a folder, a forming plate, means for operating the forming plate. and the folder, a work support carrier, two alined pins rotatably and slidably mounted in bearings in the carrier, and a work support adapted to be engaged by the proximate ends of the pins. i

9; A machine of the class described having, in combination, a folder, a forming plate, means for operating the forming plate and the folder, a work support carrier, two alined pins bearing inthe work support carrier in which the pins are rotatable and slidable, latches for holding the pins from sliding movement when desired, and a work support engaged by theadjacent ends of the pins.

10. A machine of the class described having,in combination, a work support carrier, two alined pins mounted upon the carrier, said pins being provided with grooves in their ends, a thin fiat work support, opposite edges of which are provided with notches, whereby the edges of the work support may be received in the grooves in the pins, and the pins may extend into the notches in the work support, means for pressing the work against the work support, and means for folding the margin of the work.

- 11. A machine of the class described having, in combination, a folder, a forming plate, means for operating the forming plate and the folder, a work support carrier, a work support pivoted to the carrier, and yielding .means' for normally holding the work support in a position inclined to the horizontal. 12. A machine of the class described having, in combination, a forming plate, a folder, a work support yieldingly held in a position inclined to the horizontal, means for bringing the forming-plate down upon the work on the work support and swinging the work support into a substantially horizontal position, means for locking the yielding -means,' and means for operating the folder.

'13; 'A machine of the class described having, in combination, a work support, a folder, a thin sheet metal forming plate having a pin fastened to it at its lower end, a forming plate carrier having a socket to receive the pin, meansfor detachably fastening the pin in the socket, and means for operating the forming 'plate and the folder. 14. A machine of the class described having, in combination, a work support, a folder, a thin sheet metal forming plate having spaced pins fastened to it at their lower ends, a forming plate carrier having sockets to receive the pins, means for detachably fastening the pins in the sockets, and means for operating the forming plate and the folder.

15. A machine of the class described having, in combination, a work support, a folder, a thin sheet metal forming plate having an upstanding flange, spaced pins having their lower ends fastened to the flange, a forming plate carrier having sockets to receive the pins, and means for fastening the pins in the sockets.

16. A machine of the class described having, in combination, a work support, a forming plate, a bending plate, a folder located above the bending plate, a filler plate located .above the folder, and a cover plate located above the filler plate, said cover plate being adapted to clamp the filler plate in position and being pivoted for swinging movement away from the filler plate, whereby, when the cover plate has been swung out of the way, the filler plate and the folder may be lifted out to permit the bending plate to be removed and replaced.

17. A machine of the class described havhorizontal bending plate, a work support carrier, a work support pivotally mounted on the carrier and normally yieldingly held in an inclined position with its inner edge above the level of the bending plate whereby a piece of work may be placed upon the work support with its margin to be folded overhanging the bending plate, means for pressing upon the the level of the bending plate whereby a piece of work may be placed upon the work support with its margin to be folded overhanging the bending plate, means for pressing upon the work and the work support to swing the work and the work support downward and thereby bend the margin of the work upward, means for operating the folder to fold the margin, and means for causing the work support to press the fold against the under face of the folder.

19. A machine of the class described having, in combination, a work support, a folder movable over the support, and an edge guide normally located in the path of movement of 4 mg, 1n combmation, a folder, a substantially the folder, and adapted to be moved out of said path.

20. A machine of the class described having, in combination, a work support, a folder movable over the work support, and a pivoted edge guide having its operative portion normally located in the path of movement of the folder whereby the edge guide is swung about its pivot by the moving folder.

21. A machine of the class described having, in combination, a forming plate carrier, a sheet metal forming plate, means readily manipulated by the fingers of the operator for detachably fastening the plate to its carrier, a Work support carrier, a sheet metal work support, means readily manipulated by the fingers of the operator for detachably fastening the work support to its carrier, a sheet metal bending plate, a folder, and means for operating the forming plate carrier and the folder.

22. A machine of the class described having, in combination, a forming plate carrier, a sheet metal forming plate, means readily manipulated by the fingers of the operator for detachably fastening the plate to its carrier, a Work support carrier, a sheet metal work support, means readily manipulated by the fingers of the operator for detachably fastening the Work support to its carrier, a

sheet metal bending plate provided with 10- cating holes, means for engaging the holes and for clamping the plate in position, a folder, and means for operating the forming plate carrier and the folder.

23. A machine of the class described having, in combination, a work support carrier, a sheet metal work support, a plurality of lugs on the carrier, and a plurality of springpressed members readily manipulated by the fingers of the operator for detachably fastening the work support to the carrier, a forming plate, a folder, means for pressing the work against the work support, and means for folding the margin of the work.

24:. A machine of the class described having, in combination, a work support, a folder, a sheet metal forming plate located above the work support, a carrier for the forming plate, there being interengaging members formed respectively upon the forming plate and the carrier, means located above the forming plate in a position readily accessible to the operator for drawing the members together or for permitting them to be disengaged as may be desired, and means for operating the forming plate and the folder.

In testimony whereof I have signed my name to this specification. PERLEY R. GLASS. 

